Another solenoid valve question.

This is the solenoid valve bolt I was talking about.

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Bill comments...

Howdy again. Yes, this is indeed a manual over-ride for this solenoid valve.

It appears to be an air pilot operated valve. By that I mean that inside the solenoid housing is a small 3/2 NC air valve which, when the solenoid is energized, allows air from the supply to shift the main spool inside the body.

That's why the over-ride is where it is. On this valve, the over-ride simply opens an air path for the supply air (center port on the bottom of the valve shown) to diverted, through an internal path, and allows that diverted air to shift the spool, simulating the operation that occurs when the solenoid is energized.

Good to see that you've got an LED in the DIN connector for the solenoid. Having a light in the DIN connector answers very quickly the question... "is there power getting to my valve" and that helps diagnose an air circuit problem.

Cheers,

Bill